Beginner in Office add-ins and VS code here...

I followed the steps from this MS tutorial on creating an Excel custom functions add-in. Because I want to debug it using VS code, I had to create an Excel Custom Functions Add-in project option in the Yeoman generator, with TypeScript selected as the script type (according to MS).

The add-in works fine, but the related debugging tutorial from MS doesn't seem to work. Any breakpoint added appears as unbound, plus there's a "read source map" error, which might be related (see screenshot).

Any ideas how can I make this working?

Thank you for your time,

Adrian